C# 文件下载

在a标签href属性直接写文件地址有些文件不会进入下载(例如 图片类型)，浏览器会自动打开预览
这时可以使用下面这种方式进行文件下载

Html代码

<a href="/DownloadFile?fileName=fileName&path=path">点击下载</a>

C#代码

        /// <summary>
        /// 文件下载
        /// </summary>
        /// <param name="fileName">文件名(下载后的名字)</param>
        /// <param name="path">文件路径</param>
        public void DownloadFile(string fileName, string path)
        {
            HttpContext.Response.ContentType = "application/ms-download";

            string s_path = path;
            WebClient wc = new WebClient();
            wc.Encoding = Encoding.UTF8;
            byte[] temp_byte = wc.DownloadData(s_path);

            HttpContext.Response.Clear();
            HttpContext.Response.AddHeader("Content-Type", "application/octet-stream");
            HttpContext.Response.Charset = "utf-8";
            HttpContext.Response.AddHeader("Content-Disposition", "attachment;filename=" + fileName);
            HttpContext.Response.AddHeader("Content-Length", temp_byte.Length.ToString());
            HttpContext.Response.BinaryWrite(temp_byte);
            HttpContext.Response.Flush();
            HttpContext.Response.Clear();
            HttpContext.Response.End();

        }